I had a serious go at trying to find this adjuster this weekend and failed dismally. All I found when peering thru the right rear wheel bolt hole at 7 o'clock was what appeared to be a rivet head. There was nothing that I could find that would accept a flat bladed screw driver. I spent a good hour grovelling around on the floor trying to see in with a flashlight. I pretty much tried all points in the wheels rotaton without much luck... has anyone got any advice, or maybe a picture of what I should be looking for?

I have a South African spec 2006 3.0D, is it possible that this variant has a different adjuster mechanism? It is pretty much the last itteration of the E53 before the E70 came out.